STRAP-SUPPORT 5299231 - Caterpillar

Cooling Fan System Troubleshooting Problem List
Problem: The cooling fan does not move.
Probable Cause:
The hydraulic oil level is low.
The cooling fan control is faulty.
The system pressure is low.
The fan control valve is faulty.
The engine control is faulty.Problem: The fan control remains at one speed only.
Probable Cause:
The fan control is faulty.
The fan valve is faulty.
The fan control valve is stuck.
The fan control wiring has failed.Problem: The system is overheating.
Probable Cause:
The hydraulic oil level is low.
The hydraulic oil cooler is plugged or dirty.
The suction filter is clogged.
The system pressure is too high.
There is excessive load on one or more systems.
There is a restriction in a line.
The oil cooler bypass valve is faulty.Problem: Response of the fan system is sluggish.
Probable Cause:
The control valve is faulty.
The oil is not at operating temperature.